YouTube is famously reliable for its source pool of hilarious, adorable, and compellingly shareable dog and cat videos. So, with October nearing an end, What's Trending took the opportunity to compile the best of these furry friends' costumes for Halloween 2012!

Director Nash Edgerton, working from a script by his brother Joel, understands that when you're putting a puzzle together, some of the pieces have rounded corners -- but a lot of them have sharp edges that draw blood.